Hello Sir,
Your father in law can very well transfer you funds from Saudi Arabia. The Amount will not be taxable as it is a mere remittance of funds and no income arises here.
Your daughter falls under the definition of Relative too. Hence NO Tax shall be payable and you use the funds for construction as well as buying a car.
Trust this clarifies your query.
Feel free to call / get back in case of further clarifications.
Thanking You.
Regards,
Rohit R Sharma
BCOM, ACA, LLB-GEN, CERT. FAFP