NEW : Doctors ask family to go to hospital for precautionary checkups . Lexi was hospitalized after complaining her feet hurt . Family sought shelter from snow in winter , warmed each other 's frostbitten bodies . Frederick Dominguez and his 3 sons were out running to the Christmas tree .
NEW : Doctors ask family to return to hospital for precautionary checkups . Lexi Dominguez hospitalized after complaining her feet hurt . Family sought shelter from snow in culvert , warmed each other 's frostbitten feet . Frederick Dominguez and his 3 children set out Sunday to cut Christmas tree .