First of all,
you need to calm down. Yes sometimes own parents are the ones giving us more problems then our inlaws. You have bite it thru because you are staying with them.
Will you be moving to your own place anytime soon?
As for the lotion, ignore your mum, don't care if she is angry about you applying it, apply while she isnt around you.
You are the mother and you meant well.
As for your brother. well. probably he isn't mature yet.
Just ignore.
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