What should the parents-in-law do if they use Feng Shui to talk to the grandchildren in order to get the eldest son to pay to build a house for the younger one?

My husband’s hometown is in a remote mountainous area. My parents-in-law have very little savings, basically no income, no pension insurance, and no medical insurance. My husband is an only child and has two sisters. According to rural customs, the son's sole responsibility for supporting his parents-in-law in their old age is that if a house is built, the son will inherit it.

My husband and I basically got married naked. My parents-in-law didn’t give any gifts or jewelry. We didn’t have a house or a car. We had to work hard on everything ourselves. We work in a first-tier city, bought a house after getting married, and are still repaying the mortgage. One child, considering having a second child. At present, I have some savings, which is enough to build and decorate a house in my hometown (more than 500,000 yuan). I am a single child and I have two elderly people to support.

The house in my hometown was built for more than 20 years, and my parents-in-law are now in their early seventies. They felt that the house leaked and did not face south. They wanted their son to pay for the rebuilding, but they did not agree to repair or renovate it.

I feel that my husband and I are under great financial pressure. The expenses in first-tier cities are high. We have to raise one or two children and four elderly people. Moreover, my parents-in-law basically have no income or security. After building a new house, we are unlikely to go back to live in it. Since our registered permanent residence is not in our hometown, we can only inherit the right to use the house. I plan to save some more money to buy a semester house, which will be needed for my children’s studies, and it can also be used as an investment.

At first, my husband and I opposed them building a house, and my parents-in-law were often angry and noisy. Later, my husband couldn't bear that they were unhappy all the time, and wanted to agree to it. He also understands that old people build houses mainly for the sake of face and appearance, while rural people regard building new houses as a lifelong career and pride. However, it’s hard for me to accept this kind of flattery. What should I do