First, the progress of social employment system.
Nowadays, many young people work outside for a long time. If the village asks them for help, they will be happy to come back because every family needs to build a house. But when people come back, their wages will be deducted when they take time off, as well as entrance fees, bridge fees and so on. Your family has a small labor force, and his family has a large labor force, so you need to make corresponding compensation. My distant cousin has four sons, but my cousin has none. Although they are relatives, it is unreasonable to help others for a long time. Only by giving proper compensation and paying some work expenses can relatives and the village live in harmony and help each other.
Second, the imbalance of labor force.
Take my home as an example. My old house is very old. If we decide to rebuild it, we don't need to pay the construction cost as others in the village say. We only need to buy materials, so it doesn't cost much to build a house, but my family can't. We have been working outside for decades, and we have never helped others build houses before. People don't owe us jobs, so we can only pay people to work. In a big family, how many days has a worker helped pay the bill? Everyone knows how many days he owes Zhang San or Li Si. If Zhang San or Li Si built a house that day, he had to go over and help, just pay back the days he owed, and the main family didn't have to pay it back.
In short, existence is the most reasonable. If someone owed you a lot of work before, it is unreasonable to ask you to pay for it now. You can make it clear to him. If you don't owe each other, it is reasonable for him to ask for a certain amount of work expenses. I don't think it's reasonable for others to pay for their work.