Father not social distancing

Hi, my daughter has been visiting her dad (who lives with his parents) still through lockdown. At the beginning the conditions for her going were as long as they make sure they’re careful, preventing the spread of corona, hygiene, not allowing our child to see anyone etc.
I’ve since found out that whilst my child has been staying at his he’s had a child family member from another household (who are not social distancing) go around to see our kid. He’s had friends around for a bbq, and he’s been spotted walking down the Street a couple times, carrying a crate of beer with different mates all from seperate households.
I have medical issues myself and a young baby here, to say im fuming is an understatement. I can’t believe that he’s put my family at risk and i trusted him to see her. I’ve said she cannot go around anymore and he’s denied it lying and just hasn't even replied back since.
I just wanted some advice on where do i stand here? How can he get away with putting us at risk like this, surely if we catch it because of him breaking social distancing then its a crime especially if one of us gets badly affected.
I also feel like he's an irresponsible parent, this isn't the first time he's lied regarding our daughter when questioned. I'm thinking shall i go down a court route when this is over? The dad is in his 30ʼs.
Replies
With the coronavirus situation i don't trust him no, i know there's no way he's going to be social distancing, he'll be lying to have our daughter around. As far as he goes as a father, he is pretty much half arsed yeah, his mother does everything when my child goes there. When dd comes home all i ever hear about is what "nan done or said" she never talks about what she's done with Daddy, he's genuinely never spent any quality time alone with our dd (we've been split 5 years) he won't even pick her up on his own in the car.
I'm just seeing how things go with the coronavirus atm and giving at least a few weeks until she sees them again, and that's dependent on how things turn out. After that I'll have to speak to citizens advice at least xx