LNAB should be Müller -- wikitree can handle the umlaut. He calls himself Miller in his will, so yes, CLN should be Miller.
A lot of the extra kids look like duplicates or conflations. If any of them are from entirely different families, detach them.
Otherwise, make a list of the real kids. What I'll do is take each real kid in turn, clean up one profile and get all the best-quality sources in that profile. Take any profiles that are really duplicates of that one, and merge all the higher-numbered profiles into the lowest-numbered profile.