Perfect timing. Awful timing. Depends on who you ask.

Kasie, the former babysitter of the Williams family, moves away just as Guest moves. When Dean and Jane ask for some assistance in watching Guest's younger cousins, there's no real reason to say no. Guest could fill in until the family finds another babysitter.

...they stop looking for another babysitter.

The only assumptions here refer to what Drake has up his sleeve next.

Nothing about your identity or reason for moving in has been decided for you. Whether you were recently orphaned or just wanted more company, the choice is yours. Similarly, whether you're even upset with the situation or are going to confront your aunt and uncle over this is entirely up to you as well. The story shapes itself around you.

They're all counting on you.

Explore the dynamics of the cousins and tend to their needs as you figure out how they react to your unique actions and the actions of each other. Try to keep them from messing things up long enough to establish peace or let them run wild as some form of revenge — your choice.

Make a decision.

Do you leave things the way they are? Renegotiate your terms of living? Walk out completely? Only time will tell.