Board Thread:The Flash discussions/@comment-9346948-20180523070317/@comment-26618197-20180523144438

I thought for a moment that Thomas was Caitlin's dad but not only do we not know his name it wouldn't make sense to "find him." Unless it was a memory, however, Killer Frost on Earth 2 was going to have a brother so as TheDoctor said Thomas could be her brother. A youtuber named Pagey suggested Caitlin's dad could be Icicle Sr. so maybe they had a son but his powers were so erratic and there was a risk of him being taken away so maybe they hid him? Killer Frost could've found him at some point and maybe that flashback from earlier made her realise what was happening so she gave Caitlin a heads up.