'Real Housewives of Atlanta' alum Kim Zolciak claims her estranged husband, Kroy Biermann , is physically abusing their kids and having sex so loud they can hear him ... TMZ has learned. In bombshell court docs, filed by Kim and obtained by TMZ, she claims Kroy threw one of their sons over the couch during a heated argument at his home. The 'RHOA' alum also claims Kroy's been having sex with multiple women in recent months, including with one woman who stayed at his home and vacationed with the