Thanksgiving Dilemma

Thanksgiving is the week before I’m due. My in-laws live almost an hour away and being in the car longer then 15 minutes is already a challenge being so uncomfortable. I told my husband I don’t want to go. We’d be up there for a minimum of 6 hours. His family is nice in an uncomfortable way if that makes sense. I’m just at the point where I don’t want to pretend to be happy and social. My dilemma is I have a 2.5 yr old son and this is our last holiday with just him. I have no problem with them going but at the same time I’m like do I just suck it up and go so I can have this last holiday with him or stay home and rest ...? The mom guilt is getting me 😩