Yes, Aniline & ethyl amine react with Grignard reagent to give alkanes beacuse R in grignard reagent accept's acidic hydrogen from aniline and ethylamine to give RH which is an alkane. Now depending RMgX selected alkane will differ
eg.
CH3CH2NH2 + CH3MgBr ----> CH3CH2NHMgBr +CH4