Hi My fathers MUM was polish could i get a Polish passport and what would i need to do this i have a UK passport is it ok to have both
Depends on a lot. Yes, it's fine to have both.
First question - when did she get a British passport?
If u have a UK passpoert then whats the point of getting a Polish one??? Makes no sense
It's cheaper in some respects. For instance, it's much easier to get a visa to Russia with a Polish passport than a UK one. You can also get a handy ID card, useful for EU travel - and the passport is about 1/3rd of the price.