My sister is a 57 old civil servant that has few years to retire.
She's currently separated from her husband,just left with her lasborn staying with her.
There's this one of her junior brother that has issues with his marriage,resulting in making his 2 girls to grew up with Grandma,now the grandma is dead,and the dad of the teenage girl has a new wife that might be harsh on the girls,their mom is jobless and stay in her parents house.
Is it a must my sister takes the teenage girls to live with her, considering the childhood background with Grandma of those girls,it might not be easy to control them,and the financial aspect as well,as one is about to write jamb

If your sister can afford to help then let her by all means help.

If she can't help for a long time then let her help for the little time she can.

Those girls can easily be maltreated or sexually abused if they fall into the wrong hands.

Thanks, it's just that I am seeing it not easy taking care of children that grew up with Grandma and now they are mature, Moreso the father wants those kids to be with him with the new wife