Hello, HS12, and welcome to the Grammar Exchange!

Your sentence:

I have a friend than whom my father speaks English better 

is totally ungrammatical.

"than" needs to appear after the adjective in comparative degree.

If you want to use a relative, you can choose one of these:

- I have a friend whose English is not as good as my father's.
- I have a friend who doesn't speak English as well as my father (does).

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