There is Qatar airways Visa which is applicable only for immediate family members like Parents, siblings and spouse. They need to fly with Qatar airways, no restrictions on where they stay…. maximum stay is 56 days.

Other one is Tourist visa, which you can get it from the hotels in that case they need to stay in the hotel for the whole period. Normally issued for 14 days can be extended. I think they need to show International credit card/QR.5000 (Not sure)

Once you are settled, you can bring your parents/brother/sister on a family visit visa, there is a age restriction for that, they should be less than 60 yrs to get the visa through proper channel. The duration of this visa is one month which can be extended up to six months.