Exposed Taxonomy Filter - get Related Terms in results

Hello,

I would like to use an exposed taxonomy filter with a dropdown of terms, where if I select taxonomy term a1 and click search I get all nodes with a1, b2 and c3 (as they are all related taxonomy terms). I found this #604624: Showing the nodes under a taxonomy term AND under the related terms that is kind of close, but I would like to be able to search with an exposed filter and get results of nodes under these terms. Is this currently possible with views?

A
-a1 (is related to b2 and c3)
-a2
-a3
B
-b1
-b2 (is related to a1 and c3)
-b3
C
-c1
-c2
-c3 (is related to a1 and b2)