This languages are not similar to each other.
"relatives" of Finnish is Estonian, Karelian, Komi, Khanty, Mansi, Mordovian or even Hungarian
Is languages of Ugro-finnish group of Altai family.
But German from German group of Indoeuropean family - it is closer to Russian, than Finnish.
German has nothing in common with Finnish. It's very oddly to hear such opinion.