Will my father succeed in his business? (P.L. USA)

My father always loses money by someone or the other cheating him in whatever he does. It is affecting the whole family as a result.

Your father, as well as his incomes and finance situation are instable. We could say that he has suffers losses for at least the last 4 years (throughout self illusions and mistrust).Things may be a bit confused to him for a while. He may identify with fantasy or other forms of illusion and it will be the same at least until the end of 2011. Hard and fast logic doesn't mix well with his personality during these years and he must be in a great suffering in consequence of this. You can't do anything to change this situation taking in account your father's authoritative personality. However, in 5 units of time (probably 5 months) he is going to improve his incomes.

As for your second question regarding your mother and your sister in law: as already mentioned,  your father is an authoritative person and he is probably dominating your mother who is very warm and kind. However, she might not choose to say the right words to your sister in law and this could be the reason for the tension which you might notice. Nevertheless, your sister in law is fond of your mother so you shouldn't be bothered by this. My advice to you is to let things go on their course as there is a good possibility for an improvement in the near future.