however they see eachother as family, she did help raise him a fair bit, and no she was around them a fair amount.
seems very unlikely I at one point did think so, and think it may still be possible, but it is in no way confirmed.
Also if Calia was bolvar's lover, Anduin would have known, and would have told him or her as soon as he found out both of them were alive, and he knows they both are.