Don't even consider taking your children out of Yeshivah to help with livelihood.

On the contrary, their Torah study increases the blessings you need for livelihood and health. Look for other solutions, but do not reduce that which brings these blessings. Also, make it a habit to set aside a few coins for charity before morning prayers. https://www.torahrecordings.com/rebbe/igroskodesh/014/003/4883