Police are searching for a Massachusetts mother who is thought to have kidnapped her five children , preventing authorities from treating her 2-month old daughter in need of medical care . Yurong Wu , 41 , of Quincy , is wanted for parental kidnapping and child endangerment , and is believed to have fled to New York City before losing custody of her children to the state last week . She is believed to have taken her children Yu Fan Mei , 10 , Kelly Mei , 8 , Kethy Mei , 6 , Kate Mei , 2 , and Kalen Mei , two months . Scroll down for video . Yurong Wu , ( left ) 41 , and Jackie Mei , ( right ) 50 , face charges of child endangerment after Wu disappeared with her five children . Police believe the mother , who also faces kidnapping charges , took them to New York City . Department of Children and Families officials was given custody of the children last Wednesday after they could not find them at their home managed by the Quincy Housing Authority . The youngest child is believed to have serious health issues and was in 'dire need ' of treatment , police told CBS Boston . The children 's father Jackie Mei , 50 , was arrested Friday and charged with child endangerment and misleading a investigation after allegedly being uncooperative with police . He posted $ 1,500 bail and was released with a GPS device . Court documents show the father saying that his wife turned off her phone and told him that she would take care of the children . His lawyer says he does not speak English and does not know about the whereabouts of his wife or children . Wu and Mei 's children Yu Fan ( left , 10 ) , Kelly ( center , 8 ) and Kethy ( right , 6 ) were taken along with their younger siblings Kate , 2 , and Kalen , two months ( not pictured ) Department of Children and Families officials gained custody of the children after they could not find them at Wu and Mei 's Quincy home ( pictured ) Police in Massachusetts are working with New York City authorities to find the family . The family has relatives in the metropolis and NYPD visited a house in Brooklyn on Monday night but did not find the children , Quincy Police spokesman Capt John Dougan told Daily Mail Online . It is not believed Ms Wu wants to harm her children , and neighbors say she was concerned about losing custody of them this winter , according to the Patriot Ledger . The mother and her children , who have no car , may have left weeks ago , a neighbor told NECN . Stephen Hensley said that he saw the woman and child get in a van and leave around the time of 'the first snowstorm ' and he had not seen them afterwards . Capt Dougan said that the police currently believe that Wu left with her children shortly before Department of Children and Families officials came to her home . He said the investigation is still focusing on New York City and that he is 'confident ' that Wu and her children have not left the country . The Meis ' neighbor Stephen Hensley ( pictured ) said that he saw the mother and children get into a van weeks ago .
Yurong Wu , 41 , wanted for parental kidnapping and child endangerment . Quincy , New York , family believed to have relatives in Massachusetts . Father Jackie Wei still in Quincy , arrested for misleading police . Neighbors say mother and children may have left weeks ago .