amitaphobia
Amitaphobia is the fear specifically of one's paternal aunt.
Fear of your paternal aunt
avunculusphobia
Avunculusphobia is the fear of one's maternal uncle.
Fear of your maternal uncle
fibliphobia
Fibliphobia is the irrational fear of one's paternal aunt or uncle.
Fear of your paternal aunt or uncle
mibliphobia
Mibliphobia is the fear of one's maternal aunt or uncle.
Fear of your maternal aunt or uncle
sororophobia
Sororophobia is the fear or aversion towards one's sister.
Fear of your sister
yifuphobia
Yifuphobia is the fear of one's uncle who is also their mother's brother-in-law.
Fear of your uncle that is your mother's brother-in-law