I'm not one for blackmail on normal occasions but in the situation of troublesome siblings...
Observe them. Take note of what they value, be it a certain food or drink, perhaps the company of a certain friend, so on and so forth. Pick which of those you can somehow use to... persuade them.
no subject
Observe them. Take note of what they value, be it a certain food or drink, perhaps the company of a certain friend, so on and so forth. Pick which of those you can somehow use to... persuade them.