Need advice from parents with magic kids

Ok so.

Hanging with my niece last night. Dont remember how we got on the subject.

We got in to talking about how she can see and communicate with spirits and shadow people.

She knows and bit about herbs and crystals (I dunno shit)

I want to help her. But she isn’t my kid (my sisters)

My theory is confirmed that there is some type of “bloodline” that my granny. Mom. Maube my sister. Myself and my niece have.

How can I help her and not go behind my sister’s back??

Thanks?

question 1 dose your sister practice if yes talk to her and lets her do the teach if she not but know about you and is ok with ask her if is ok to ask your nice if she wants to learn from you then is a simple yes or no from niece

My sister doesn’t. But I think she is aware.

I am hesitate to bring it up because my niece was having seizures and taking meds.

She hasn’t had any in 2 years

Then maybe ask only your niece in private to see like if she wants at least