Please help I’m really confused

I'm a expat living in some country under 30 years old single, and supporting my family, who live in a rented house back home ($400/month). I've saved $55K (In 2.5 years from my salary) and want to buy land for $80K but am $25K short. To cover this, l'm considering selling my own personal car used by myself and borrowing from friends (which I can repay in eight months). Building on the land will cost another $35K, which I plan to do gradually over two years. This also means postponing my plan to buy a new car for my family back home. (We already have car but it is old) A bank loan isn't an option. Would love to hear from those who've faced similar choices. What would you do?