Anyone’s hubby’s do comp. gaming?

So my husband has been having his brother stay with us for the past few months (not by my choice) and his brother got him onto this computer game “escaping tarkov” well he literally spends hours on it. We just moved into a bigger place since we’re expecting our second child so his computer is in the basement... so I never see him. If I’m home to watch our son he’s down there with his brother who has moved into the basement against my wishes... they still up till like 3-4 am playing... I never see him... his son never sees him when he plays that game... he’s never up here when I get our little one ready and settled for bed... and our baby girl is due in April and I’m just feeling like this game is his main priority... what to do??? 🙁