There are multiple definitions - click on the translation that matches your context.

direct lineal heir means:

• slektning in rett nedstigende linje
• slektning i nedstigende linje
• livsarving

slektning in rett nedstigende linje means:

• lineal descendant
• lineal heir
• direct lineal descendant
• direct lineal heir
• relative in direct line of descent
• relative in the descending line