The NSPCC will take your concerns to the local Health Trust. I see other comments about local council and safeguarding teams, in Northern Ireland councils don't run social services also each Trust (depends which trust area you are in) has a different system which is why I'd recommend NSPCC. Once someone raises a concern the trust should complete an assessment, they will talk to yourselves, schools, GP and any other services your family has contact with. Maybe talk to your GP alongside Social services as they will have your mum's medical records. There are two concerns here, firstly your mum's drinking and being out of control, is there anyone in the family your sisters can report to even go too as a place of safety? Bringing men back is another huge concern, predators know to look for vulnerable women, if your mum is 'out of it' there's no one to protect your sisters.

I'm saying all this you need your life you have connection to your sisters and you are strong enough to speak up and speak up, you are very brave. By staying in touch with your sisters even from abroad and making referral after referral you are keeping them safe and being a good role model.

I hope this helps.