You can try to change their cage. But be prepared if they reject all the babies. You will need a brooder, and experienced handfeeder, and depending on the age, you will need to give up your sleep too.
Unless the cage is physically broken and causes a threat to their safety, you should just leave them be until the chicks are fledged and weaned. About 8-10 weeks old for cockatiels.
Cheerio the peach faced lovebird.