oh man I should have explained this! so after fantastic four 588 it goes to FF 1-11 and then fantastic four 600, then they start rotating ff12, 601, etc. up until FF 23 which is the end of Hickman's run.
and yea Franklin Richards is a mutant, like maybe the most powerful? idk
the blonde girls is Valeria Richards, their daughter, Franklin's lil sister. She rules