Could this be the Host series by Leo Hunt? The three books in the series are 13 Days of Midnight, 8 Rivers of Shadow and 7 Trees of Stone (published in 2015, 2016 and 2017 respectively).
There's a book with eight spirits rather than seven, and a dead father rather than a dead uncle, but otherwise it looks fairly close to your description.
According to this review, the protagonist's father was 'the host of a famous paranormal TV show'.
A blurb for the first book from Goodreads:
When Luke Manchett’s estranged father dies unexpectedly, he leaves his son a dark inheritance: a Host of eight unique, powerful, and restless spirits. Unfortunately, Luke has no clue how to manage them, which the ghosts figure out pretty quickly. Armed with only his father’s indecipherable notes and a locked copy of The Book of Eight, Luke struggles to adapt to his new role as a necromancer. Meanwhile, the increasingly belligerent Host mutinies, possesses Luke’s mother, and forces him out of his own house.
Halloween, the night when ghosts reach the height of their power, is
fast approaching, and Luke knows his Host is planning something far
more trick than treat. With the help of school outcast Elza Moss, who
knows a bit about ghosts herself, Luke has just thirteen days to
uncover the closely guarded secrets of black magic and send his
unquiet spirits to their eternal rest.
