Mindfulness:
Put her on birth control and let her move in with him for four weeks.

jagugu88li:
Your sister is has been in a relationship with him for three months and "claims" to be noticing marriage passes. Have you considered the fact that it might be your sister who wants to marry. I mean young girls have this crazy belief that dating a old guy qualities them to be matured and we all know majority of ladies think about marriage when dating. If this is the case with you sister, convincing her not to marry will get her married soon.

On the other hand there are cultures or let me say man that feel complete only when there is a wife by their side, maybe this man is one of them. Even if she marries him life wont be as bliss as it might be now. 3months, 5kids and old man should tell her that the arrangement is sick. This is equivalent to being denied happiness and your sister, by agreeing to it will be deliberately doing it to herself.

If you have to lie to protect her, go ahead. Create a stupid scenario, summarizing all these comments


Thanks jagugu88li for this. I knew I could count on u.

positivec:
OP, If I may ask, do you love her? If you do,you will forgive her. Situations bring the worst in people and sometimes people take advantage of vulnerable people.
If you say, she has a good character and she stayed with your ailing Father. Don't you think that she loves you , to have made such a huge sacrifice in this era.
If I may ask, what is her gain . Do you pay her?.
Fight the devil that has entered this wonderful relationship and not the girl.
GET HER AN ACCOMMODATION TOO