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I was so surprised at how supportive he is of me and what I am doing. He thinks it is great what I am doing, esp. since I like it.

Not sure why you are surprised MWG, after all you are relieving him of some of the financial burden that you are currently undergoing.He has to be very grateful for that as it removes some of the burden and responsibily from him.Especially as he is not inclined to actually get a job himself. Maybe he thinks he can be a house husband whilst you support you all.
Be nice if you could especially as you enjoy it so much.
Glad things are going wel and hope he manages to fix the spark plugs.