>>85491311That's not how conditional probability works. Say there are two siblings, Sibling A and Sibling B, and Sibling A is the vtuber. Then there are four possible scenarios, each with a probability of 25%:
1. Sibling A is male, Sibling B is male
2. Sibling A is male, Sibling B is female
3. Sibling A is female, Sibling B is male
4. Sibling A is female, Sibling B is female
Knowing that the vtuber is female just removes the first two scenarios, leaving scenarios 3 and 4, so the conditional probability of the other sibling being male or female is 50-50.
