what u got to work out how much ur business is worth and how much he wants to buy,
is he only wanting to buy in a he thinks you are making a fortune of his work
i nearly went in to partnership with my bro in law, but he was demanding 500 a week, even if he wasnt working so told him to stay where he was working
what happens with the money he pays you does it go to you, or does it have to go in to business, what happens if you need new stuff, who decided what u buy
ask your self do you need a partner