If you have both sides of family nearby, how do you handle..

Our local family is small on both sides, just 1 set of parents and 1 married/dating sibling on each side. We do every thing all together.
CA angel

We host Thanksgiving at our house, my parents, sisters, their spouses and their inlaws all come, my dh's sister her husband and her mil and grandmother inlaw come, his dad and step mom (his mom has passed), his grandma, his aunts and uncles who are in town, plus we have several families we are friends with who join us. For about 30 people in total. 

Christmas Eve my husbands dad and step mom host the same exact crowd. We do gift exchange for adults and we all shop for all the kids. We have dinner, track santa, etc. Then on Christmas day, grandparents make the rounds to see the grandkids haul if they feel like it, we have a selection of snacky foods for whoever drops by and we stay home.  

Most of my family is a couple hundred miles away so we get together to celebrate Christmas on a weekend in December. We spend other holidays primarily with DH family.

2 of DH's brothers alternate holidays (or so they say), what typically happens is when it's the wives turn to spend the Holiday with her family that's what they do, when it's the DH turn, well, they "stop by" and visit with the wifes family and come late to our function. I find it annoying because I host the majority of the Holidays and DH's sister always wants to wait for the late comers. I have in recent years put my foot down, and if I say dinner is at 4:00, then by golly I serve at 4. DH's family is huge - he is the oldest of 8 and many of our kids are grown and have their own families.

We take turns going to mine or DH's family on Thanksgiving.  For Christmas, we celebrate on different days.  We celebrate just Christmas Eve with our kids and the other parents have our kids on Christmas Day so it is just DH and I.  

I refuse to travel through town on holidays so we don't split the day: we split holidays. For example, I do Easter every year with my inlaws but Christmas always with my family. Thanksgiving is an every other year thing: one year with my inlaws, the following year with my side, etc. I like it so much better than shuffling around all day trying to fit everyone in.

We do Christmas at home and then spend different days with each family. Thanksgiving is with my family and the day before or the day after (which ever they choose) is with DH's.
I'm lucky in that my IL's many, many years ago decided they wouldn't fight for the day of celebrations. We choose a day close to the holiday to get together and that way there's no back and forth about who's turn it is to be there. It's been very, very nice. So nice that if it becomes an issue with my own children, we'll choose an alternate day for our own family gatherings. We don't have to worry about it this year, because dd and her dh already have a plan in place for the holiday. He has divorced parents but luckily we only have to share them with his mom. His dad is a butt head who didn't even bother to show up for their wedding.

We have 3 girls, and there is a family that my girls know that have 3 boys, the same ages as my girls. They only live 2 miles away. I tell my girls that they should marry the brothers! It will make the holidays much easier! haha!

We used to alternate. Now that we all have adult children, we no longer get together for Thanksgiving or Easter. We invite DH's single brothers to our house.

It's way too hectic to try to see both families for every holiday.

We go to neither side even though we both have siblings in town. We spend holidays with DH's BFF, his wife and their families and it is SO much nicer. No drama, everyone gets along. We like that.

When our moms were still alive, we would be roped into doing Christmas 7-14 days early with DH's family because SIL and her family would go out of state over Christmas through New Years every year and it was always a huge hassle. Not to mention she is a vegetarian (normally not a big deal for us with other people who are, but she would make things harder than they had to be over that, too), so no turkey, ham, etc. even if we were willing to cook it and bring it.  We both worked retail at the time and it was difficult to do all the shopping for his side so early and find weekend time to squeeze in a get together when we were putting in long extended holiday hours at work at the same time. Then they would be gone over the actual holiday so we would be guilted into spending the holiday with my depressed, alcoholic MIL, yay...

FWIW, my family wasn't any better to spend the holidays with. My mom had Alzheimer's so that had its own kind of challenges, one of my siblings was/is quite unstable but would always be around because of mom, and most of my sibs didn't get along with each other so there was usually some kind of infighting going on. Sigh.

So we spend our holidays with our "adopted" family, LOL. It's just better. And we get to eat turkey and ham. Bonus!

Everyone gets together at one house. Is it crowded yep....but no one cares. It is usually at my house and everyone enjoys seeing 'the other side.' Would never think to divide up. The crowd can expand at anytime because ALL are welcome. Friends, family, neighbors

As I understand from the peas this is almost unheard of in Refugee Pea Land.