Male 7/2/1966 and female 2/24/1971

Hello,

My sister is dating her boyfriend for about a year. He was born on 7/2/1966 and she was born on 2/24/1971. She is currently living with her ex-husband to care for her twin of 2 years old, that was their agreement. Her current boyfriend was introduced to the ex-husband, shook hand, but he is very jealous of the ex-husband. She loves her current boyfriend and he does too, but they always bump head about the ex-husband living in the same house with her. So she decided to stay at her current boyfriend place more now, but he's just so jealous and not trusting her. Do you think they can get through? Will their relationship last? They both love each other a lot.