I'm not sure that the horary board is the place for these questions. But here is the short/long answer:
In your own chart, the 4th house is the house of the father, and the 10th house is the house of the mother - pay special attention to the domicile rulers of those houses. If you were born at night, also look to Saturn for the father and Venus for the mother; if a day birth, look to the Sun for the father, and the moon for the mother.
Look at how any of these factors come into play with your ascendant and ascendant ruler. The point of the ascendant represents you in your chart.
For siblings, the third house and Mars both have some signification.
For black magic, curses, secret enemies, etc., look to the 12th house.
If it were your own chart, you would probably want to look at a solar return, the profected year chart, and a time lord technique like circumnambulating the profected ascendant through the bounds, but if you're just starting then that's probably an overwhelming amount of information to process.
If you were to do a horary chart, you'd draw up a chart for the moment and place you ask the question, e.g., am I under a curse? is my (whatever relative) trying to hurt me?
Horary has its own rules for interpretation, you can find some in the horary technique sticky at the top of this forum.
I do wish you the best, but it's all kind of complicated stuff.
Could you just ask the offending party or parties why they are throwing away the food you just prepared? Do they speak with you at all?