"Is X to do with Y" is perfectly grammatical, and reasonably common. For example:

Is this question to do with English Grammar? If so, the tag "grammar" is probably appropriate.

"X is to do with Y" is also valid:

This document is to do with our company's new policy on IT usage.

 

This inspection is to do with the new health and safety regulations.

"Is X to do with Y" is perfectly grammatical, and reasonably common. For example:

Is this question to do with English Grammar? If so, the tag "grammar" is probably appropriate.

"X is to do with Y" is also valid:

This document is to do with our company's new policy on IT usage.

This inspection is to do with the new health and safety regulations.