Taxes in Germany??

Hi, Me and my mom will be going on a trip to Germany for two weeks. We are leaning on living there but theres one big problem. Taxes. We know we qualify for a limited residential permit according to the German Mission in California. But would we still pay the high German taxes? My dad works and lives in the U.S. and my mom gets paid spousal which supports her. I get child support which is tax free here. If we were to move to Germany for a year our income wouldn't be from Germany its from my dads U.S. job so would our income tax be based on U.S? If sow how? Because my moms spousal is taxed by state but we wouldn't be living in any particular state so how would that work too? Also is child support taxed in Germany? That would be a big problem. If we were to be taxed in German our USD dollars would first be converted into how much we net in Euros right? She nets $108,000 a year so in Euros thats 82644.63 €. How much would German income tax on that amount be? If anyone could answer all these question it would be great! Thanks, Christopher