Quest. Why doth he not require the like kindness to Mephibosheth the son of his dear Jonathan?
Answ. Either he and his were now extinct, or by their after-miscarriages had forfeited his favour.
For so, i.e. with such kindness either as I cannot express, (as the particle so is elsewhere used,) or as I command thee to show to them.
They, i.e. Barzillai and his sons; for though Barzillai only be mentioned, 2Sa_17:27, yet his sons doubtless were instrumental in the business, especially Chimham, 2Sa_19:37,38.