Can somebody help me?

Okey so, i saw a message on my father's phone it's kinda unusual cuz he never use phone only when he calls his sister or his cousin. And well yea i read the message it was about he asks a woman how's her day ect, he also send her like "good morning/night" everyday when she never answer. It's kinda uncomfortable to talk with him rn, i never had any problem with him and i know if my mother will find out here will be a big problem (if my mom gets angry she would break things)
Should i send him a message so he will read it in morning? Bc maybe if i talk w him today my mother will hear it..
(sorry for bad english, just can't think straight rn..)