All the three Ahadith have been narrated from Dhul Joushan, father of Shimr. Being relative of a bad person does not make one bad also. Ubaydullah Bin Abbas was grandson of Imam Ali and he deserted Imam Hassan and joined Muawiyah, does that make his father untrustworthy?
And as for the saying of Bukhari, he merely speculates that Narrations have come through son of Dhul Joushan rather than directly from him. And most importantly, one has to see the content of narration also, if it is sameas other narrations from different narrators, why should there be any problem.
Shimr, the son of Sahabi Zil Jawshan, himself is a medium in those hadiths.
And we have no issues with the notion that a believing person could father a non-believer or vice versa. A good example is Yazid's own son, Muawiya Ibn Yazid, who was a true believer and refused to sit on the masnad e Khilafat on the grounds that it only belongs to the Aal e Mohammad (saww).