This seeming simple question is actually one of the things that English speakers find to be most confusing in Spanish. There are basically two words that mean "for". These are "para" and "por". The proper use depends completely on context.
"Por" is used when the context is "transactual", or an exchange. Examples: "Gracias por su ayda"(thanks for your help) - thanks given in exchange for help. "Puedo comprarlo por cinco dólares" (I can buy it for 5 dollars)- Money given for a good or service. "Trabajo por mis padres" (I work for my parents) - I work in exchange for my parents or I work in their place.
"Para" serves for the other uses. Examples: "Compré ésta para ti" (I bought this for you) - I purchased this to convey to you. "Trabajo para mis padres" (I work for my parents) - I work to convey the work to my parents - my parents are my boss.
If you are unsure of which one to use, just use one. If you are incorrect, a good Spanish speaker will still understand what you are trying to say, and hopefully will correct your useage.
Sister in law in Spanish is cunada.
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