Critical Thinking Riddle to Tickle your Mind

This is very interesting critical thinking #riddle which will tickle your mind. In this mind tickling brain teaser you have to calculate minimum number of tickets you need to buy for 4 father, 3 grandfathers and 4 sons. Think out of box to solve this critical thinking brain teaser and post your answer in the comments.

Can you solve this critical thinking riddle?

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5 Tickets
Let's put the relationship as below
A-B-C-D-E where B is father of A, C is father of B, D is father of C and E is father of D.
Now A, B, C and D are sons (Four Sons)
B, C, D and E are father (Four Fathers) and
C, D and E and Grandfathers (3 Grandfathers)

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