Booking flights and hotels separately for a vacation can sometimes save money, especially if you are able to find good deals on each individually. It also allows for more flexibility in terms of choosing different airlines and accommodations that suit your preferences. However, booking a package deal can sometimes offer convenience and cost savings, as well as added benefits like transportation and activities included in the package. Ultimately, the decision depends on your budget, preferences, and the specific deals available at the time of booking. **

No, the sister of the husband of your sister is not your sister-in-law. Your sister-in-law would be the wife of your sibling, not the sister of your sibling's husband. In this case, the sister of the husband of your sister would be considered your sister's sister-in-law. **

Yes, you can travel with your underage sister as long as you are her legal guardian or have permission from her legal guardian. If you are not her legal guardian, it is recommended to carry a notarized letter of consent from her guardian allowing you to travel with her. Additionally, some airlines and transportation companies may have specific policies regarding minors traveling without their legal guardians, so it is advisable to check with them before making any travel arrangements. **

Yes, the sister of your sister can be your half-sister if you share one biological parent with her but have different biological mothers. In this case, you and your half-sister would share one parent and have a different parent on the other side. **

Your sister is the aunt to your sister-in-law's child. This relationship means that your sister is the sibling of the child's parent (your sister-in-law), making her the child's aunt. This connection is based on blood relation and family ties. **

Without knowing the specific situation or context, it is difficult to determine if your sister is overreacting. It is important to consider her feelings and perspective, as what may seem like an overreaction to you could be a valid response based on her emotions and experiences. It may be helpful to have an open and honest conversation with her to better understand her point of view and address any concerns she may have. **

It is important to look for signs of addiction in your sister, such as a preoccupation with using a substance, withdrawal symptoms when not using, and difficulty controlling or stopping use despite negative consequences. It would be helpful to have an open and honest conversation with your sister about your concerns and encourage her to seek professional help if needed. Remember that addiction is a complex issue and seeking support from a healthcare professional or therapist can provide guidance on how to best support your sister. **

I'm sorry, but I am not able to provide medical advice or diagnose illnesses. It would be best to consult a healthcare professional to determine if your sister is sick and to receive appropriate treatment if needed. **