ABANDONED. Boy named sandy, family into coma, mental asylum down the street, lighthearted novel?

[Staciarain]

This is a book about a boy named Sandy whose parents go into a mysterious coma and he is left to be taken care of by the butler guy. There's a mental asylum down the street full of interesting people that they eventually get to know. A nurse is sent to take care of his parents that (I think) he ends up falling in love with. There are two relatives of the family constantly trying to poison them or harm them to get their money or house (or something). Please help!

[April Ann]

Could it be Love Among the Walnuts by Jean Ferris?

"Born and raised in isolation in a wealthy, eccentric family, Sandy is shocked when he, his parents, and their servants become victims of a vicious plot by his greedy uncles to incapacitate them and take their money."

[Lobstergirl, au gratin]

Staciarain, are you still looking for this or did you find it?

Was it April Ann's suggestion?

[Lobstergirl, au gratin]

No response in 2 years. Moving to Abandoned.