Question:
When sitting shiva on a sibling does a sister observe just thru shloshim or all 11 months
Answer:
Mourning on a sister is not 11 months, nor is it 12 months for his father and mother, but only 30 days. And after 30 days, you’re back to being allowed in everything. Only if there is no one to say “Kaddish” after her, do charity and say Kaddish on her during the year, that is, 12 months for the exaltation of her soul.
With the blessing of your comfort from heaven, you will no longer pain.
Sources:
בית יוסף ושולחן ערוך (יו”ד סי’ שצא, שצב, תב) ועוד בדוכתי טובא.
