The river is so high and moving so fast I don't believe it would be safe enough to take the kids bank fishing. I know Conroe is closed but Raven is open at Huntsville state park. You'd be better off taking them there either with or without the boat. It's a beautiful park with lots to do other than just fishing too in case the kids get bored.
I called them yesterday and they were open then. You can take your boat or rent canoes, yaks, or pedal boats there. And there's a couple three piers to fish from as well as bank fishing.