I will discuss the Type Ia supernova remnants (SNRs) Kepler, G1.9+0.3 and the interacting SN IA PTF11kx, in the frame of the core degenerate scenario for SN Ia.  The comparison of the morphologies of these SNRs to those of some planetary nebulae is intriguing. This comparison suggests that some SN Ia explodes inside a planetary nebula.  The SN Ia inside a planetary nebulae (SNIP) is predicted to occur in the core degenerate scenario. The features of two opposite protrusions, termed ears, in SNRs of SN Ia and of core collapse supernovae and their similarity to ears in planetary nebulae teach us a lot about the role of jets. I will present new interpretations of these.