Responses
I might be totally wrong.....
But I did see a post that said that the man assisting old Mikasa could also be Armin because of the figure, it seemed a bit more "chubby(?)" in a sense and Jean would've been a bit more taller than that. But it being Jean might be the case and the other adults and children are their kids and grandkids as well.
I can't be sure but there's a lot of post regarding that chap, that it is not jean and not their grandchildren and mikasa never had any other guy and she only have adopted daughter
Spoiler to those who even read the ending chapter
Someone tell me in the ending chapter was that Jean and Mikasa visiting Erens grave with their child? Or do Mikasa and Jean do end up getting married and have a kid. Because Eren would be so heart broken but I guess he’d also be happy too. Life man everyone moves and grows, I don’t want that :(