Is There something wrong with my baby male guinea pig?

My Female guinea pig had babies on march 6 and are quite big now. one baby is a female and the other 2 babies are boys. there names are Mumu,ace,and brandy but im concerned about ace.brandy always purrd around the female and when i put the female near the males cages they try to get out of the cage but ace doesnt, he doesnt even purr or sniff butts rapidly or try to get out of the cage when theres a female. i dont know whats going on, the females arent even pregnant because the other males (father and brandy) try to mate with them still. Can someone please help me?