Sister has married lover on lockdown

Dear Christine,I just can’t seem to reason with my sister.She has a man who is married, and she calls his house all hours of the day and night, identifying herself and demanding to talk to him.She gives him photographs of herself in all sorts of poses and in skimpy clothes. She goes into his cellphone and obtains his friends’ numbers then calls them and tells them off. She is now living with him and has a child for him and treats him like a prisoner.She constantly changes the phone number and if any of his children want him, they have to wait to call him at the office.He can’t even bring his other children’s pictures into the house. She just wants him to herself and her child. I’ve tried telling her she is wrong and that she’s got to remember how she got him, and that somebody else could try the same tactics. But she says she doesn’t care.How can you advise somebody like that, Christine? – B.G.R.Dear B.G.R,Your sister seems ruthless and domineering. I feel in time her partner will break the chains that bind. It is not right that she should keep his children from him.I’m sure you’ve been advising her, but it seems to fall on deaf ears. You’ve just got to leave her on her own and I suspect it won’t be long before he   says “enough” and moves on.When the time comes resist the temptation to say “I told you so!”.– CHRISTINE