Depends on how and why you've 'massively overstretched' yourselves and what you plan on doing about it beyond raiding the kids savings.
If it's borrow from the kids instead of sacrificing alcohol or takeaways or a holiday or the new kitchen, then no, absolutely not, tighten your bloody belts. If it's a unforeseen emergency, and you prioritise paying it back immediately by sacrificing luxuries, then maybe. Which makes it your emergency fund; you have no savings for your children.
If it's scrambling to meet regular payments, then no, make the hard choices now instead of next month. If it's a genuine one-off, then maybe.
If it's money others have given them, that they know about, or have worked for, that they manage themselves, then no, they will judge your poor financial planning and every tiny unnecessary expenditure you make before paying them back. If it's money that is invisible to them, that will be replaced without them knowing, then maybe.
And so on.