OP - please ask. Your child needs to be sat with people they know and trust to ensure the day goes smoothly for all of you, and the strangers you don't know.
Regards this whole mixed up seating:
So you go to a wedding with your family, or partner, and then don't get to sit next to them at the meals?
And people really do this to their guests?
It sounds horrific and tbh I'd be really questioning whether I would even attend under those circumstances.
Dh would be fine. He's naturally incredibly sociable and loves meeting and talking to new people. I would find it really stressful and hate it. I'm naturally shy - something I have tried to work on but it is still incredibly difficult and doesn't make for a happy carefree day.
If I go to a wedding or such event with my Dh and my family I'd expect to be day with them.
I'd be interested if they do split couples up - who do they leave the child/children with? Which parent gets them, or so they separate more than one child so a parent gets one each?
Or do they keep a family household together and then seat them with another family household?
Gosh, I'd much rather sit with the people o know.
I don't attend someone's wedding as a networking event or to make new friends.