A word from the good people at FINDRS...

 The databases that are currently in use by FINDRS do not pull relatives to the 4th degree of consanguinity (there are no known databases that can do this). There are options available to you that FINDRS can help with if during the course of exploring a family you are unable to identify any 4th degree relatives and/or you are needing those to be identified.

To do this, it would require an IDENTIFIED 2nd or 3rd degree relative. Once one or more of those are identified, you may submit a Quick Find 2004 or the Diligent Search Form 2277 on the identified 2nd and/or 3rd degree relative(s). You would need to note on the form that the listed person(s) are a 2nd degree relative and you need that individual's relatives ran to the 2nd degree. This will produce a list of 4th degree relatives for the child(ren). For the identified 3rd degree relative(s) you would do the same except you would ask that 1st degree relatives be ran and this would produce a list of 4th degree relatives for the child(ren).

You can dowload these forms by following the link below:

Link to Diligent Search Forms