My step daughter

So my 3 year old daughter was watching YouTube on my phone and she came running to me saying mommy (blank) took the phone and wont give it back well i got out the bath tub to get my damn phone from my step daughter whos 14 and just got grounded by her dad cause he found out she had sex in the movies anyways i went to go get it and she started cussing me out cause i texted her father today when he was at work and told him she was asking me to sneak her boyfriend over and she got mad cause i told!! Now she has me and her dad fighting cause he said i shouldn't of left my phone with my daughter while i was Taking a much needed bath!!:/ who the hell is in the wrong