Srimad-Bhagavatam Canto 3: Chapter Twenty-three, Text 52: PURPORT
It is said that the father himself becomes the son in another form. The father and son are therefore considered to be nondifferent. A widow who has her son is actually not a widow, because she has the representative of her husband. Similarly, Devahuti is indirectly asking Kardama Muni to leave a representative so that in his absence she might be relieved of her anxieties by a suitable son.