Stars Valerie Bertinelli, Kelsey Grammer and Lauren Graham will also search their family history on the TLC series
"Game of Crowns" will revolve aroud a group of moms who'll stop at nothing to get that tiara
The deal is part of Warner's ongoing international TV expansion strategy
The long-announced takeover is now completed
UK production company is behind the TV hits "Waterloo Road" and "Supernanny"