  By extending the SU(3) flavour symmetry breaking expansion from up, down and
strange sea quark masses to partially quenched valence quark masses we propose
a method to determine charmed quark hadron masses including possible QCD
isospin breaking effects. Initial results for some open charmed pseudoscalar
meson states and singly and doubly charmed baryon states are encouraging and
demonstrate the potential of the procedure. Essential for the method is the
determination of the scale using singlet quantities, and to this end we also
give here a preliminary estimation of the recently introduced Wilson flow
scales.
