Nope...kids are entitled to clothes on their backs, a roof over their heads, and food on the table. That is all, well I think they are entitled to love and affection also.
We have 2 adult DS's. When the first one went to college he went to CC and we paid (not too expensive and we had the funds). Then DH got laid off, and I had just become a SAHM. Then the next year the other DS went to college. Now, he applied to some really good engineering schools, but also applied for an ROTC AF scholarship to pay for it, since he knew we didn't have the funds. As a matter of fact the layoff came after he received his financial aid package at the school he picked. I contacted them, gave them the new finanical info, and they came up with the money we couldn't. He got some more grants, work study and a loan from the college itself. The school was great about working with us, but DS knew that we didn't have the funds.
Now the older DS is getting married in 1 week, and he never asked us at any point for any money. He knows what our financial situation is. I have asked him if they need anything, and is there anythign we can do, and he keeps saying no.
As a parent you are under no obligation to pay for anything. Now, if we had the funds, we would have loved to pay for DS's education and for my other DS's wedding.