Three generations, in the notation you already use
Each person with their symbol — square, circle, diamond when it is unknown, triangle for a pregnancy — their name, their birth and death years, the cross for whoever is gone and the double outline for the index patient. Couples are joined by their line, carrying the kind of union — married, cohabiting, engaged, separated, divorced, annulled — and the years it started and ended.
Children hang off the couple's line, as the notation requires, and each carries its filiation: biological, adopted, fostered, step, twin or identical twin, and the pregnancy losses that so often explain a whole generation. A household is drawn around whoever lives together, with its own name.