Generally, no, your wudu does not break if your sister touches you.
Islamic jurisprudence distinguishes between touching someone who is a mahram (a close relative with whom marriage is prohibited) and someone who is not. Your sister is a mahram. The majority of scholars hold the view that touching a mahram does not invalidate wudu.
Here's a breakdown:
- Mahram Relationships: These are relationships where marriage is permanently forbidden due to blood relation, marriage, or fosterage. Examples include your mother, sister, daughter, aunt, and grandmother.
- Majority Opinion: Most Islamic scholars agree that simply touching a mahram does not break wudu. The focus is generally on actions that nullify wudu, such as relieving oneself, sleeping deeply, or other specific acts.
- Different Opinions: While the majority view is that touching a mahram doesn't break wudu, some scholars hold different opinions regarding touching non-mahram individuals. However, in the case of your sister, these differing opinions are not relevant.
In conclusion, based on the prevalent understanding within Islamic jurisprudence, physical contact with your sister does not invalidate your wudu.
