สืบราชวงศ์(sʉ̀ʉp-râat-chá-wong)

[to] continue the royal lineage

to continue the royal lineage, dynasty, or bloodline (often distinguished from สืบราชสมบัติสืบราชสมบัติsèup râat-chá-sŏm-bàt1[to] succeed to the throne2succession to the throne, which means to succeed to the throne)