Irrational

D seems so irrational that it's hard to know how to handle it.

He wants to assert his rights as an adult, since he's 18.

But, he also asks us to buy things for him, to take care of him, as a total dependent.

The sailing team finally was officially approved by the principal. This sets up D and his friends to have an official team in the races. He needs a dry suit before sailing starts. The costs for all this don't seem to enter his head.

What lines am I willing to draw? And cross?

With my brothers, I quickly worked out what I was willing to do and what I wasn't. I won't lend / give them money (any amount, any time), but I will feed them at my house. And when J was in prison, I encouraged my dad to send money to help out.

I need to work out what I am willing to do (and not do) regarding D.

During the next 3 months, as he hopefully finishes high school, do I tolerate any and all use? Only use outside the house and away from me?

Am I really willing to kick him out of the house over this?
I just don't know.