Help my sister stay with her children

Hi. My name is Paulina and i am raising funds to help my sister stay with her babies. She is a devoted mother and wife and is now facing deportation (due to immigration law) and needs to pay for visa and medical fees. Due to this she is unable to find work and her loving British husband is struggling to keep a family of 4 on his own. Now they face these unexpected fees because she arrived back to UK just after the deadline (this was due to COVID19). Her boys are 9 and 3 and both need their mommy to stay in the country. Any help is greatly appreciated.