Welcome to HSC!
Sometimes a simple, "This is what God is calling me to do." Will silence people. (not ALL of them, lol! but some...)
They can take their argument to The Higher Authority if they don't like it.
If you are married, then you could also refer them to your dh. It's funny that people will feel comfortable telling the wife how they feel, but when handed over to the husband, suddenly it becomes a non-issue... "I have my husband's supprt in this decision, perhaps you'd like to speak to him?" OR "My husband and I have prayed and feel this is where the Lord is leading us as a family." (kinda kills two birds with one stone with that one.
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You CAN home school your ds. Even if you are single you CAN homeschool him.
I'm a single mom of three.. and there are many single parent's on this board that have homeschooled and graduated their children.