It's truly pathetic how my in-laws only support my brother-in-law

My brother-in-law is well into his 30s and has been preparing for the civil service exam for 10 years.
Despite his hidden debts, they just bought him a house worth hundreds of millions of won and even covered his gift tax.
They pushed me to do stock trading while I was unemployed (and I ended up losing money too), but they haven't given our side even a single penny.
He doesn't work and just receives millions of won in support every month.
It's like they're performing a ritual just to ruin their own child.