I disagree that "in series" makes the V and I in phase, If the load is only resistive, then yes. You can say that the current through each element in a series circuit is in phase. ( but not the voltage)
As for Parallel it depends on the components in the different branches. Consider 3 branches, a resistor, an inductor and a capacitor ( all ideal) -- they each have a different V & I relationship. The Voltage across each branch is the same, but not the currents ( unless the branches are identical - of course)