S/O - calling people you're not related to "Aunt" or "Mom"

I call my MIL mom. It fits her and all the other in laws call her mom too. It doesn't seem to offend anyone in the family.

I did call another woman mom till she passed away this past May. I still refer to her as my mom and her children call me their sister. She was in all ways except biological my mom. She was there for me when my mom wasn't. She took me under her wing as a very lost and confused teenager and has remained in my life for 23 years till cancer took her from us. I'm pretty sure my moms feelings might have been stung by this relationship, but i don't feel bad for it. I was blessed to have this woman in my life and who loved me regardless.

A couple of my daughter's friends call me mama and I don't mind one bit. Neither does my daughter.

My parents had friends who we called aunt and uncle, but they were very very close friends.

My DH has a best friend that is closer than a brother to him. They've been friends since middle school. My boys have grown up calling him "uncle" even though they know he's not related. This friend does not have children of his own, nor any nieces or nephews or close relatives. He treats my boys just like they were his nephews and it's been a great relationship for all involved. Not weird at all to us.

I loved my MIL dearly, but never wanted to call her mom. She loved being a "Nana" and that's what she was called by everyone except her children. She was more of a mother to me than my own mother and I was very close to her. Her passing was almost as bas as when I lost my beloved daddy.

I grew up calling my parents close friends "Aunt" and "Uncle". In our home, that was a sign of respect.

I called my MIL by her given name, as directed by her.

I have a second mom, who, like my mom, is now gone. My mother always worked, so I had a nanny and she is/was my second mom, she lived next door until I was a junior in high school and is a very important person in my life and development. I miss my mom and my other mom.

I don't have honorary aunts or uncles, neither do my kids. My ILs are all called by their first names.

I grew up with three "aunts" who were actually my moms b/fs in high school. I am 45 and they are still my aunts and considered family. However, my sister has a gazillion "aunts" and "uncles" for her kids and the door is rotating. I think that sort of cheapens the sentiment. Neither DH or I call our MILs or FILs "mom" or "dad". My cousin recently told me unsolicited she thinks that is weird. Honestly, I thought it weird she even had an opinion on what we call them. None of our parents would care if we called the other "mom" or "dad" and both have kid in laws that do so, it's just not what we do. (But then DH calls his dad by his first name as well, so there's that.)

When I was a kid, there were a few friend's moms I called mom. I also called my MIL mom.

In my family everyone who is an adult is called Auntie or Uncle. My mothers best friends are Auntie and Uncle ___ to me. DH calls my step dad Uncle because sdad was close to the family back in the day. I call one of his former neighbors Auntie because that's what everyone calls her.

Its honestly never clear who is actually related by blood and who isn't.

Same for me.
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growing up in a Hawaiian family, everyone is an Auntie and Uncle.... My kids call all of my cousins and close friends Auntie and Uncle.

My kids do not call anyone aunt or uncle if they are not their aunt or uncle. Not that I think it's wrong it just never happened. I don't know why but it just never came about.

There were a few select long long time family friends whom I called aunt or uncle growing up. In some cases I was much closer to these people than to one of my relatives. It certainly wasn't every random friend or acquaintance just a select few to whom we were very close.

I have a ton of first cousins - but a handful that are super close and I consider siblings - we basically grew up together. My closest cousin (like a sister!) is pregnant and we've already decided I will be "aunt" to the baby, instead of "first cousin once removed". When they are older, we will explain the actually relationship but still have each other's kids call us "aunt".

Auntie is different than an aunt, an auntie is from the heart , not blood. Now that is out of the way,

My cousins children all call us aunt and uncle when we have contact with them.

My husband's nieces and nephews are our age. I am not going to be called aunt by them.

Both of my parents came from big families and I had a bunch of bio aunts and uncles. Since I came along toward the end of my parents large brood, I didn't have much of a relationship with most of them because their kids were all teenagers by then. 

My kid has a bunch of bio aunts and uncles on my side, but only a couple of them have taken the time to build any kind of a relationship with her. We only see DH's sister and her family a couple times a year, and in spite of us sending their (now teenage) kids birthday cards with gift cards and money and Christmas gifts all their lives, she couldn't even manage to put a card in the mail for my six year old this year. So TBH I don't give a crap if DD has a relationship with her or not. 

On the flip side of the coin, many of our friends have made an effort to show interest in DD and they genuinely enjoy being a part of her life. They come to her birthday parties, have invited us to come for Christmas and Thanksgiving, etc. IMO they are her true "aunties and uncles" even though they have no blood relation because they are the people who have shown her in no uncertain terms that they actually care about her. Some are honorary aunts/uncles, others are honorary grandparents. There is nothing skeevy or weird about it at all.

I occasionally called my MIL 'mom' when she was alive but was never very comfortable with that because she wasn't the mothering type at all. Now that my own mom is gone, I call my BFF's mother 'mom' without hesitation and my kid calls her grandma. When Mother's Day comes we send her a card and flowers. I've known them for over 25 years and both of them are closer than most of my own family to me.