I know that God moves in mysterious ways, but this is a bit too mysterious for my liking. It appears to be a case of a perceiving something that you want to in an otherwise random assortment of shapes. The family, themselves, appear to take comfort in the appearance of the image, saying "We've had a tough couple of months; my mum's been really ill and it's comforting to think that if he is there, he's watching over us."
After a quick perusal of google I have realised these kinds of sightings are a lot more common than you might think. In recent years Jesus' face has appeared on, among other things, a beer bottle, a fish stick, a shower curtain, a nebula, a pancake and a tortilla: