For a man no.For a lady its possible and can be withstood.

Being a church elder he knows better. Siring kids with a sister is not right especially for him now that he is bound by the law which is clear unless he is ready to loose his church leadership as the bible is clear on the characters / qualification of a church elder - A man of one wife.( Titus 1: 6- 9) Let him realize that children come from God ( based on Ps.128). He has an option of adopting a child which is the best decision they can come up with as a family.Unless as someone said anatafuta sababu ya kulungulize the sister inlaw. The other thing ladies have issues.He may decide to discard church leadership and go after the sis inlaw, who once she bears kids aanze matharau ndogo ndogo towards the elder sis who is unable. Is he in a position to see his wife undergo such trauma????Jibu analo yeye.

Mtu biz are u trying to suggest that Impunity is either maini or kingangi

That way they will be committing INCEST! Tell him to go back to his bible to read again.

Leviticus 18:18 (New International Version, ©2011)

18 “‘Do not take your wife’s sister as a rival wife and have sexual relations with her while your wife is living.

Sasa hii verse uliipata kivipi na ukifanya nini? Waah! Am impressed. I know there are sooo many church elders who have no idea about that verse.