Ask the Assessing Officer as to where is it stated that you cannot give salary to a blood relation above a particular limit. All it says that the amount should be justified.
So in order to justify the same you can show that your qualified for the role he is handling in your business, which proves that the salary is based on his skill and ability.
You can also support it with the bank statement and TDS certificates.
Trust this clarifies your query.
Feel free to call / get back in case of further clarifications.
Rohit R Sharma
BCOM, ACA, LLB-GEN, CERT. FAFP