It's okay my dear my mom use to do that kind of things too.
Don't worry be happy.
The problem you have got is all because of your nand. She is continuously teasing you by giving cheap gifts and telling you about hers.
I think you might have told her or you in law about what your mom did or they know it.
Don't give attention to what your SIL says and your problem will be solved.
Sis kisi kay diaay huway cheez say zindagi naheen guzarti so why do give so much value to those things.
One of my sister give lots of gifts to her in laws for almost a decade. She even gave her husband land to them when they asked but they never ever give her a sing penny. Even a single dua but instead gave badduas and kicked her out. She is so careless still love them call them. Force her husband to talk to them. Even her husband don't want to talk to them. Her in laws never calls. Give buddua directly to her. Make false accusations. But still ask for BIG MONEY. She is so careless. She says I'll get reward from Allah.
Se become careless about your in laws specially your SIL behaviour and talking always cut her out when she would start saying things which bother you.
Also become careless about your mom too.
Believe in Allah he will give you gr8 things through your husband Insha Allah.
You become over sensitive about this very stupid matter.
Don't ever ever ever give importance to material. It's nothing.
I know it's hard but not imposible.
So cheer up. Love to give to your in laws to make Allah happy. He will give you more. Beleive me.
oh very sad to read that bro! and confused yes gr8heera is also saying the right things. these jewellery and fashion all these stupid things will not go with you in the grave, all would be your imaan and good things which you have ever done with others.
just leave such things and come out of the thoughts of these things just think broadly with wisdom.
i hope you would have understood my words.
best of luck
:)