Upvote:1
If they are citizens of a country which is allowed visa free entry in Germany, such as the USA, then they can travel to Germany and apply for residency when they are here.
However, if they are not from such a country then you have to apply for a family reunion visa for your family members in the country where they are currently resident.
If they are already in Germany, then they would have to return home in order to apply for and be granted the visa.
Please bear in mind that the processing of such visas often takes many months.
Please ensure that you and your family meet all the requirements before applying, as this will ensure a smoother quicker application.
You can find more details here: https://www.germany-visa.org/family-reunion-visa/
Upvote:2
You cannot get the visa changed. You can apply for a different visa while you have a short-stay visa, but a tourist visa has a maximum of 90 days, and might be granted for less.