Question from a hindu

I am a Hindu, born and living abroad, non-Indian. I want to clarify that I know nothing about Sikhism. Living in a territory where there is almost no Sikh presence. People often ask me questions about it. But being a Hindu I cannot answer them. I have recently studied Sikhism but several questions always run through my mind.

1) Do you consider Hinduism as the mother religion, sister religion or having no connection with Sikhism?

2) What do you think about the concept of Brahman? That it is the same entity as Waheguru but understood differently? Or that it has no connection? Or that the concept of Brahman comes from a misunderstanding of Waheguru? Or Brahman is fake ?

3) Do you think that Hindu gods are fake? or that the Hindu gods are agents in the service of Waheguru or Messengers in the service of Waheguru whom the Hindus misunderstood and started worshipping?

Thanks in advance for your answers