I'm only 7 weeks along. They'll be able to tell at my 9 week appointment! Just two more weeks. Lol hard to wait.
Twins skip a generation, your kids are more likely to have twins.
Fraternal twins are genetic, so yes, you have a high chance of having twins and also your daughters would since they'll get it from both sides.
I believe that if twins run in your family then it is more likely that you can convince twins yourself