Ma'zoor sleeping through an entire salaah period

Q: 

1. If the wudhu of a mazoor person (urine incontinence) sometimes, but not always, lasts through a short salaah period, namely maghrib, will he still be considered a mazoor? 

2. If he accidently sleeps through a salaah period, he will not know whether or not something exited, since movement is little during sleep, it's unlikely something exited, will he still be considered a mazoor?

Settling one's debts before giving nafl sadaqah

Q: I will be receiving about R50 000 in inheritence. 

I am married with 4 kids but my husband doesn't always provide. I work, and earn a basic salary and most often I am paying for my children's clothes or treats etc. 

I want to give 10% of my inheritance in charity, however I do have debts to pay and most of the time, my money is all finished and I can't buy myself anything. 

Is it better to give out the amount as sadqah or better to pay off my debts and my zakaat which is due and keep the rest as an emergency nest.

Performing qurbaani while one is a musaafir

Q: For Eid, I'm going to see my family abroad. I'm only going for one week so I will be a Musaafir. One condition of wujoob for Qurbaani is that a person is a Muqeem. I am planning to do zabah of an animal there. 

The question is what intention do I make? Is it Nafl? If its Nafl, can I then do esaale thawaab of it instead of doing it from my own side? Or will it become waajib when I buy the animal even though I'm a Musaafir?