Yes, if you want to.
Your 2nd cousin's daughter is your 2nd cousin once removed.
Your dad's 2nd cousin is your 2nd cousin once removed.
you call your mums cousin a 2nd cousin, because your mums cousin is her 1st cousin, wich makes your mums cousin your 2nd cousin.
Your 2nd cousin's daughter is your 2nd cousin once removed.
your 2nd cousin, or maybe your 2nd cousin once removed.
2nd cousin, but if it's your Dad's 2nd cousin... then your relationship with that cousin would be a 3rd cousin.
2nd cousin
2nd cousin
Yes, marrying your cousin is allowed in Germany.
Your 1st cousin's child is your 1st cousin once removed. Your 2nd cousin's child is your 2nd cousin once removed. And so on...
Your 2nd cousin
You can date anyone you want, whether third cousin or first cousin. Going beyond simply dating may raise issues with a first cousin, but not with a third cousin.