Does reading to your preschooler make a difference? Yes!
Does the warmth, care and support your give make a difference? Yes!
A researcher from Great Britain followed children for a period of twenty years. “Parental nurturance” at age four made a positive difference through the teen years.
It’s great data and certainly encouraging for all who invest in young children.
(Although I usually give a link to the primary source, the data is bewilderingly technical, so here’s the readable summary.)