E.P.
Run away! You already have taken a side with the stricter sister. Getting between two sisters is not a good place to be, especially when the OTHER is going to feel like everyone is teaming up against her. When you pit two sisters against each other....you will lose! And criticizing a parent's disciplining tactics without being asked to give your opinion???? The husbands are going to look at you and think you started this war. (And the dad, married to the sister who is lenient may just be as lenient as his wife and could feel you are criticizing him too!) I'm still trying to figure out why this has become your concern - do your children and theirs all play together? You can have children adhere to rules in YOUR home - that's all you can do. The best thing you can do is to be an example and offer general advise if anyone asks for your advise about good disciplining suggestions and parenting advise. If you plan to continue a friendship with BOTH sisters, next time, I would throw up my hands and say, "Sorry, I don't want to get in the middle of this!" and be done! Good luck!