I agree that it's the Summer clan. The Greys only have Jean. Her sister was either latent or a non-mutant and we don't know what Sara's kids powers are. The Summers are powerful energy wielders, but adding the Jean's omega-level psychic powers takes the Summers over the top.
Then it would be the Xavier family (his daughter is pretty powerful too) then the Braddock clan (there's no telling how powerful Margaret will be), followed by the Lehnsherr (Eisenhardt) family with or with out the Maximoff twins.
Speaking of the Xavier and Braddock families, who is more powerful: Legion or Jamie?
The Grey-Summers clan, hands down.
The Cassidy clan.
They literally have their own castle and flag.
The Apocalypse Clan: , Blink, Genocide, Chamber, Frederick Slade, Hamilton Slade, Summoner, Various Clan Akkaba members and Horsemen
It's like this, Jean has great telekinetic power and Cyclops can absorb an infinite amount of ambient energy. Put that together and you get Nate Grey, a mutant who has infinite psychic energy.
Jamie's not even the strongest reality warper that the Braddocks have faced.
If Monet becomes the Omniversal Majestrix then the St. Croix hands down. The Grey-Summers take the lead because of nate and they reproduce like rabbit so theres like 17 of them so all inherited jean's omega level powers. The St Croix are more powerful than house of m and the braddoxks imo because not only is each individual powerful on their own with emplate ruiling his own hell dimension and practising in dark magic, they can all merge into one uber powerful reality warper retaining all of their individual powers.
If these Horsemen and Summoners are related to Apocalypse then the En Sabah Nur family looking pretty mean
Darkholmes please. Mystique. Destiny. Nightcrawler. Rogue. Not only are they powerful but they are smart and well liked by all -or- know how to manipulate well.
The Guthrie’s. Where the hell is Amazon? She should have been in Generation X.
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St. Croixs need a mention.. they powerful as hell and if they all merged into on being would take out more than a few families. Also Karma's family got a little juice too..