A brother whose wife has being unable to concieve for about 5years after marriage is asking the husband to marry another wife instead of going outside to impregnant a woman there by commiting adutery that it will be better to marry the woman and start having children through her. Pls what's your say to this?

What is important here is not what WE say/think but what does the husband think of his wife's request?!

Its all down to what that man desires...

This is a complicated one. By Christian Canon Law, your brother can't. No Church will even oversee the celebration of a second marriage while the first one is still in existence. My advice is that you tell your brotheer to try surrogacy or go the way of traditional marriage.

With faith things will still turn out well. She shouldn't be like Sarah that push Abraham to give birth to Ishmael, they should trust in God.