Why does the haploid drone bee not have a father and cannot have sons, but have a grandfather and can have grandsons?

Q. Read the following statements.
(i) In haplo-diploid sex-determination system, the males do not have father and thus cannot have sons, but have a grandfather and can have grandsons
(ii) In honey bee, workers are developed by the unfertilized egg by means of parthenogenesis
(iii) In human skin colour, the effect of each allele is additive
(iv) In XO type of sex-determination, male have half number of chromosome than the female.
Select the incorrect statement.

Q. What is meant by...
In honey bee, males don't have fathers & thus can't have sons...but have a grand father & can have grand sons...??

Q. Drones do not have a __(i)__ and thus cannot have __(ii)__, but have a __(iii)__ and can have __(iv)__.
The correct words for (i), (ii), (iii) and (iv) respectively are:

Q. At a family gathering, there are two males who are grandfathers and four males who are fathers. At the same gathering, there are two females who are grandmothers and four females who are mothers. There is at least one grandson or a granddaughter present in this gathering. There are two husband-wife pairs in this group. These can either be a grandfather and a grandmother, or a father and a mother. The single grandfather (whose wife not present) has two grandsons and a son present. The single grandmother (whose husband Is not present) has two granddaughters and a daughter present. A grandfather or a grandmother present with their spouses does not have any grandson or granddaughter present. What is the minimum number of people present at this gathering?