When someone has had their children taken away 3 times, do they deserve to get them back?

I know of some people that have had their children taken away by the SRS three times. Once was for a filthy house, not positive what the second time was for. Last week their newborn of almost three months was admitted to the hospital at 8 pounds. They claim to be over feeding him and he spits up all his food. I think they probably weren’t feeding him. I heard through the grapevine that he was diagnosed with failure to thrive. He was taken into custody from the hospital. The next day their 2 year old was found 2 blocks away from their house, naked. The police had her an hour before the parents even called 911. Who knows how long she had been gone. Their other two children were taken into custody the next day.

How many chances do people deserve before the judge should just find that there is no hope?