Ceremony seating

I'm trying to figure out reserved seats for the ceremony. Both sides are a little convoluted.
My dad died over a decade ago. My mom has since started dating someone who I adore, and he is coming to the wedding. Also sitting with my mom will be my brothers, one of whom is walking me down the aisle. I want to have a seat reserved for my dad to remember him, but I'm not sure how everyone should be sitting together. It will just be the 5 seats, maybe 6? My mom's father (my grandfather) will also be there, and should probably sit with them as well...
On FHs side, we have 3 sets of grandparents (only one grandmother is passed, but he wants to reserve a seat for her like I am with my dad), 3 parents (mom, birth dad, and step dad, but he will be officiating), and 1 brother plus his wife. Everyone else in his family is in the bridal party.
How would you seat all them?
For FHs side, I'm thinking mom, birth dad, brother + wife will be in the front row with mom nearest the aisle, and birth dad furthest from the aisle. Then put all the grandparents in the second row with passed grandmother's seat closest to the aisle.
No ideas on my side. Any help is appreciated.