I don't think it's his mother, but probably his stepmother. She looks very young. In videos of this genre, I like listening to the dialogues of the characters, I liked the scene in the shower when he just walked in. From the fact that there was no embarrassment, we can assume that this is not the first time they have done this while her father is not home.
Daddy sure is quick - got in and fucked his daughters like whores. But then again - he's responsible for their upbringing, so he's entitled to it. They even observe the line to get their pussy in. Sluts need society, too, and he can teach them to be their best. And I think - he's succeeded. I see they deftly worked his cock and even enjoyed it when he cummed in their open mouths.