Pheonix is in it?
If it is, and using full unbridled force, of course it wins. But that's a high end entity --force of creation itself vs some characters, lol.
Usually she -- jean-- is portrayed at like Silver Surfer, or maybe a small bit more level, though. If we consider that case, it's a much closer fight.
Either way, the Richards family generally falls short of the others.
The only one that I can think of off the top of my head that would give the Franklin Family a decent shot, against the house of El at least, is Franklin Richards from Earth-X who "evolves" into Galactus, so to speak. But since Superman doesn't get his sword and unless there are characters we are missing it would seem that the Phoenix would put the Summers family on top.
Rachel as Phoenix (one of it's weaker forms) beat Galactus, people put to much stock in Franklin because he created a pocket realm, that existed in his ball. Onslaught was a astral being made real, when he trapped people they were inside him, there is nothing that says the world he made wasn't just a reverse of what Nate Grey taught Xaiver. He caused an uproar before, but he was neutralized. As an adult he was nothing more than a powerful telekinetic telepath who could manipulate energy, what Summers/Grey isn't at least one of those! F Doom and his added lineage it won't make a difference, not one that'll let them win anyway.