Richard Cyrus was married to Emily.

But he cheated on her by having an extra marital affair.

He didn't like girls so he threw one of his two babies in a dustbin.

So Richard had ONLY ONE g/f

Coming to their children, he had already killed Wendy and Alexia (he thought so that se died)

But Richard's gf was pregnant too.
She gave birth to triplets.

I could have written all the names of the couples from the very beginning.
But that would have created a hell lot of confusion.

So just go with the flow.
Explaining each and every member of the Cyrus FAM wouls just double the confusion.