I used TK virtual seating plan which helped a lot, but when I got to my venue paper work it stated "Tables must have 8,9, or 10 people)
I had an Oh Poop! moment and emailed my venue. I had 3 tables of 6 of people that couldn't be split up, and 1 table of 7.
Mom and I ended up shifting people a bit because my stupid sister who said she won't come as it's not fair my kids are at the wedding. Mom gave them seats anyway so dad won't feel bad that I said forget you and put her as a no. We are still at our 125 paid for number.