A unified solution to the small scale problems of the $\Lambda$CDM model
  II: introducing parent-satellite interaction
  We continue the study of the impact of baryon physics on the small scale
problems of the $\Lambda$CDM model, based on a semi-analytical model (Del
Popolo, 2009). Withsuch model, we show how the cusp/core, missing satellite
(MSP), Too Big to Fail (TBTF) problems and the angular momentum catastrophe can
be reconciled with observations, adding parent-satellite interaction. Such
interaction between darkmatter (DM) and baryons through dynamical friction (DF)
can sufficiently flattenthe inner cusp of the density profiles to solve the
cusp/core problem. Combining, in our model, a Zolotov et al. (2012)-like
correction, similarly to Brooks et al. (2013), and effects of UV heating and
tidal stripping, the number of massive, luminous satellites, as seen in the Via
Lactea 2 (VL2) subhaloes,is in agreement with the numbers observed in the MW,
thus resolving the MSP and TBTF problems. The model also produces a
distribution of the angular spin parameter and angular momentum in agreement
with observations of the dwarfs studied by van den Bosch, Burkert, \\& Swaters
(2001).
