Mauricio Umansky’s marriage may be a hot topic these days but the focus is shifting to his family business this March as a new Buying Beverly Hills season arrives on March 22. Mau explains the real estate market is facing some difficulties during filming but there are still millions to earn in the realty world, and all his daughters are working with him this season. Another of Kyle Richards and Mau’s daughters, Sophia Umansky, joins The Agency this Spring. The new Buying Beverly Hills star is a “force to be reckoned with” according to her sister. The ladies are working for the “fastest-growing…