With Mahānāma (2nd) 4.7

4.7

Imaṃ kho tvaṃ, mahānāma, buddhānussatiṃ gacchantopi bhāveyyāsi, ṭhitopi bhāveyyāsi, nisinnopi bhāveyyāsi, sayānopi bhāveyyāsi, kammantaṃ adhiṭṭhahantopi bhāveyyāsi, puttasambādhasayanaṃ ajjhāvasantopi bhāveyyāsi.

You should develop this recollection of the Buddha while walking, standing, sitting, lying down, while working, and while at home with your children.