Salaah

Q: I find it hard to motivate myself to do what is right for me and my religion.

Example, I wake up three consecutive days and pray tahajjud. After that I am unable to even wake up. The same applies to the five times Salaah and seeking knowledge. I become lazy and end up forfeiting all these acts of virtues for a long period of time. When I do end up starting again, I do it for another three days and leave it again. I wish to be consistent in Allah's obedience and worship.

Q: If during the recitation of Durood-e-Ebrahim, someone mistakenly says "majit" instead of "majid", does it invalidate his prayer?

Q: When I start offering salaah, I start yawning frequently. How can I get rid of it?

Q: While travelling in a car, my family prayed the obligatory namaz sitting in the car. Later I found out that sitting while being able to stand invalidates namaz. It was also raining heavily so is the prayer valid as it was done out of ignorance or should I tell my family to repeat those prayers?

If they have to repeat it, should it be prayed as qasr?